Article
Construction & Building Technology
Kathleen Dall Bello De Souza Risson, Gersson F. B. Sandoval, Francieli S. Cofani Pinto, Marcos Camargo, Andre Campos De Moura, Berenice Martins Toralles
Summary: The study aims to propose standardization of the molding procedure for pervious concrete, ensuring its correctness in application. Research found that the proposed molding procedure produces pervious concrete within standard parameters.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2021)
Article
Geochemistry & Geophysics
Michael J. Heap, Gabriel G. Meyer, Corentin Noel, Fabian B. Wadsworth, Patrick Baud, Marie E. S. Violay
Summary: The permeability of volcanic rock can be measured in the brittle and ductile regimes, showing a relatively constant rate after shear fracture formation in the former and a continual decrease in the latter. The evolution of permeability in volcanic rock may improve volcano monitoring and hazard mitigation models.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Construction & Building Technology
Prakash Arul Jose, Alexander Gladwin Alex, Tsegay Gebrehiwet, Srinivasan Murugan
Summary: The study aims to investigate the influence of nano-Fe2O3 on various properties of cement mortar with marble powder as supplementary cementitious material. The microstructure of the hydrated blended cement mortars was evaluated, and the effect was examined using different tests. The results showed that nano-Fe2O3 improved the workability, hydration rate, strength, and durability of the mortar.
INTERNATIONAL JOURNAL OF CONCRETE STRUCTURES AND MATERIALS
(2023)
Article
Geochemistry & Geophysics
Mirko Siegert, Marcel Gurris, Maxim Lebedev, Erik H. Saenger
Summary: A new model for determining permeability in sandstones under confining pressure is presented, based on digital rock physics and derived from a 3D tomographic scan. The model simulates pressure-dependent behavior by adding artificial flow resistance to pore throats, and simulations are conducted using an in-house finite-volume code. The model is tested on a Bentheim sandstone sample and compared with experimental data, and the influence of factors such as tomographic scan and numerical resolution is investigated. Overall, the proposed model can replicate general trends of experimental data, but the magnitude of numerically determined permeabilities can vary depending on the influencing factors.
Article
Engineering, Geological
C. Mallet, A. Isch, G. Laurent, C. Jodry, M. Azaroual
Summary: The Observatory of Transfers in the Vadose Zone (OZNS-France) provides unique support for characterizing the Beauce limestone aquifer at different spatial and temporal scales. Through geological characterization and laboratory tests on core samples, this study quantifies the heterogeneity level of hard limestone rock units and discusses the double porosity. The results highlight the strong variations in properties such as strength and wave velocities with depth, indicating the presence of high heterogeneity and possible karstification in the geological formations.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2022)
Article
Geosciences, Multidisciplinary
Mark Zablocki, John T. Germaine, Richard Plumb, Peter B. Flemings
Summary: The strength parameters of mudrocks are crucial for predicting fracture gradient in poorly consolidated formations. The mineral composition and consolidation stress have significant effects on the mechanical properties of mudrocks, particularly the lateral stress ratio and the critical state effective friction angle. Laboratory tests demonstrate that changes in mudrock clay content lead to variations in these engineering parameters. The stress level also plays a role in the behavior of the mudrocks, with higher stress levels resulting in increased lateral stress ratio and decreased critical state effective friction angle. A predictive model is developed to calculate the fracture gradient based on the clay content and effective stress of the mudrocks.
PETROLEUM GEOSCIENCE
(2022)
Article
Chemistry, Physical
Karol Chilmon, Beata Jaworska, Maciej Kalinowski, Wioletta Jackiewicz-Rek, Aleksandra Podkon
Summary: This paper investigates the influence of material and technological factors on the properties of pervious concrete and proposes a new method to assess the vibration time required for its effective porosity. A model is proposed to describe the relationship between the porosity, consistency, and compaction time of pervious concrete.
Article
Construction & Building Technology
Guorui Zhu, Yanglin Luo, Chun Chen, Kaidong Shen, Yamei Zhang
Summary: The utilization of cement-based artificial marble technology can effectively reduce the consumption and waste of natural marble, thereby mitigating the negative impact on the environment. The addition of metakaolin improves the properties and microstructure of the artificial marble, enhancing its strength and durability.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Computer Science, Information Systems
Eleni Vrochidou, George K. Sidiropoulos, Athanasios G. Ouzounis, Anastasia Lampoglou, Ioannis Tsimperidis, George A. Papakostas, Ilias T. Sarafis, Vassilis Kalpakis, Andreas Stamkos
Summary: This work provides a comprehensive study on marble crack segmentation using deep learning techniques. The authors propose efficient network architectures and feature extraction methods, making an important contribution to addressing the problem of marble crack segmentation.
Article
Materials Science, Multidisciplinary
Andreia Silveira, Nikolay Kardjilov, Henning Markoetter, Elena Longo, Imke Greving, Peter Lasch, Ron Shahar, Paul Zaslansky
Summary: This study compared the diffusion of water in bone materials and found that anosteocytic bone material is more amenable to water diffusion, while osteocytic bone material retains more water. These findings reveal functional differences between the two bone materials.
MATERIALS & DESIGN
(2022)
Article
Construction & Building Technology
Hao Qiu, Binglun Chen, Fei Wang, Feiyu Liao, Meng Wang, Duanying Wan
Summary: In this study, the mechanical properties of the mortar-rock interface were investigated using a split Hopkinson pressure bar (SHPB) experiment and numerical simulation. The results showed that the interface crack growth rate in the BSCT specimen was lower than the waves in the M40 mortar, and as the loading rate increased, the fracture properties of all specimens were significantly improved, especially for the specimens with rough interfaces.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Energy & Fuels
Xufeng Liang, Tao Meng, Gan Feng, Guanghui Zhao, Zhixia Wang, Pengtao Liu
Summary: The self-healing characteristic of salt rock under the coupled thermo-hydro-mechanical (THM) environment is important for the safety assessment of underground repositories. Through treatment with self-designed high-temperature and high-pressure THM coupled equipment, the evolution of permeability and pore structure of salt rock and its self-healing mechanism are studied. The results show that the healing effect is best in the temperature range of 400-500 degrees C, and the overall microscopic parameters decrease when the temperature is 400-500 degrees C.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Geochemistry & Geophysics
Lev Vernik, Jeremy Gallop
Summary: Elastic depth trends play a crucial role in reservoir characterization and have various applications in seismic data analysis. They are closely related to variables such as pore pressure and cementation, and are significant in frontier exploration.
Article
Geosciences, Multidisciplinary
Kenneth P. Helmold, David L. LePain
Summary: Recent hydrocarbon discoveries in the Nanushuk Formation have sparked interest in exploring the Colville basin in Alaska. The formation consists of marine and nonmarine strata that were deposited by two deltaic complexes. The reservoir quality varies across the North Slope, with differences in porosity and permeability controlled by depositional texture and burial depth.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Energy & Fuels
Mohamed Garum, Paul W. J. Glover, Piroska Lorinczi, Gilbert Scott, Ali Hassanpour
Summary: The study focuses on characterizing the pore and fracture microstructures in shale using Nano-CT and FIB-SEM techniques, revealing differences in imaging nanopore structure and shale petrophysical properties measurements between the two methods.
Article
Engineering, Geological
Yulong Zhang, Jianfu Shao, Zaobao Liu, Chong Shi
Summary: This paper presents a numerical study on the dynamic behavior of rock avalanches, focusing on the influence of particle shape, size, and gradation on velocity and energy transformation process of falling rock clusters.
Article
Engineering, Civil
Chuan Wang, Zaobao Liu, Hongyuan Zhou, Kaixuan Wang, Wanqing Shen
Summary: Rock mechanical property testing under high-temperature true triaxial compression conditions is crucial for understanding the stability of deep underground engineering rock masses with high temperature. This article presents the development, calibration and application of a self-designed test system, providing preliminary results that indicate the variation of mechanical properties with different rock types and temperatures.
EUROPEAN JOURNAL OF ENVIRONMENTAL AND CIVIL ENGINEERING
(2023)
Article
Engineering, Geological
Yulong Zhang, Jianfu Shao, Shu Zhu, Zaobao Liu, Chong Shi
Summary: The objective of this paper is to study the effect of rock anisotropy on the initiation and propagation of fluid driven fractures. An improved hydromechanical model considering rock structural anisotropy is established, and its effectiveness is assessed through calibration and analysis of a typical case. Further sensitivity analysis is conducted to investigate the effects of inherent rock anisotropy on fracture behavior.
Article
Engineering, Geological
Zhan Yu, Yue Sun, Minh-Ngoc Vu, Jian-Fu Shao
Summary: A new phase-field model is proposed to simulate cracking processes in rock-like brittle materials under compression-dominating stresses. This model introduces two crack-phase fields to describe tensile and shear cracks, and proposes a new stress-based criterion to capture the evolution of shear cracks more accurately. The model is implemented in the finite element framework and successfully reproduces the cracking phenomena observed in laboratory tests.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Engineering, Geological
Lu Ren, Lun-Yang Zhao, Fu-Jun Niu, Yuan-Ming Lai, Jian-Fu Shao
Summary: This paper aims to develop a nonlinear constitutive model that incorporates the effect of crack closure in order to capture the entire process of rock deformation and failure behavior under compression. The model is based on irreversible thermodynamics and considers the decomposition of total strain into crack closure strain, elastic strain, and plastic strain. New criteria are proposed for describing crack closure strain and plastic strain evolution. Analytical solutions for the model under conventional triaxial compression loading conditions are derived, and a robust semi-implicit return mapping algorithm is developed for practical applications. The model is validated against experimental data and found to accurately describe the nonlinear mechanical behaviors of rocks, including crack closure effect, strain hardening/softening, peak strength, residual strength, and compaction/dilation transition. A nonlocal formulation is also introduced to address mesh dependency issues.
INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
(2023)
Article
Engineering, Geological
Jing Xue, Yajun Cao, Nicolas Burlion, Jianfu Shao
Summary: This study investigates the influence of the interface transition zone (ITZ) on the elastic properties of concrete and rock like heterogeneous materials. Direct simulations of a representative volume element are performed using a fast Fourier transform based method to obtain reference solutions. Analytical homogenization models commonly used are evaluated by comparing them with the reference solutions. Based on this evaluation, an artificial neural network (ANN) model is developed to improve the analytical models. The proposed ANN model is trained, tested, and validated against the reference solution, demonstrating its efficiency and accuracy.
INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
(2023)
Article
Engineering, Mechanical
Lun-Yang Zhao, Zhao-Min Lv, Yuan-Ming Lai, Qi-Zhi Zhu, Jian-Fu Shao
Summary: In this paper, a new micromechanical damage model is presented for capturing the mechanical behaviors of quasi-brittle geomaterials. The model takes into account two essential coupled non-linear mechanisms: plastic deformation related to frictional sliding along microcrack surfaces, and microscopic damage induced by microcrack initiation and propagation. The main novelty lies in a new physically based friction law that captures plastic distortion, where the friction coefficient is a state-dependent variable. The model is validated through comparisons with experimental data and previous results.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Engineering, Geological
H. L. Shi, T. Rougelot, S. Y. Xie, J. F. Shao, J. Talandier
Summary: The objective of this study is to investigate the deformation behavior of anisotropic claystone in relation to material heterogeneity. Five triaxial compression tests were conducted on Callovo-Oxfordian claystone samples under in-situ X-ray micro-tomography monitoring. Complete 3D images of the samples' full loading history were analyzed, and non-uniform strain fields were determined. The study focused on the effects of bedding planes, initial cracks, and confining stress on strain fields, and found that the structural anisotropy and confining pressure have a strong influence on strain distribution and cracking process.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2023)
Article
Computer Science, Artificial Intelligence
Long Li, Zaobao Liu, Jimei Shen, Fei Wang, Wenbiao Qi, Seokwon Jeon
Summary: This paper presents a LightGBM-based strategy for on-site rockmass class prediction in long tunnels, aiming to improve the intelligent and efficient construction of tunnels. By combining TPE, LightGBM, and SHAP, the strategy establishes rockmass prediction models using data from 7505 TBM tunneling cycles. Results show that the strategy outperforms other models and exhibits good generalization ability.
ADVANCED ENGINEERING INFORMATICS
(2023)
Article
Computer Science, Interdisciplinary Applications
Haifeng Li, Wei Wang, Yajun Cao, Shifan Liu, Tao Zeng, Jianfu Shao
Summary: In this study, a modified phase-field model is proposed to predict complex crack patterns in rock-like materials. The effect of plastic free energy on damage is considered, and a non-associative Drucker-Prager constitutive model is coupled within the framework. An accelerated monolithic iteration method is developed to solve the coupled problem more efficiently. Numerical results validate the feasibility of the established phase field model, and the investigation of the local stress field identifies the main driving forces of different fracture modes.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Engineering, Mechanical
Lun-Yang Zhao, Lu Ren, Fu-Jun Niu, Yuan-Ming Lai, Qi-Zhi Zhu, Jian-Fu Shao
Summary: This study developed an original multi-scale damage approach to estimate the macroscopic anisotropic elastic properties and failure strength of layered rocks (LR). By considering the material structure at both the macroscopic laboratory scale and the microscopic scale, the effective elastic properties of LR were determined using a two-step homogenization technique. A multi-scale friction-damage model (MFDM) was then developed to derive an analytical macroscopic strength criterion. The derived criterion qualitatively predicts the anisotropic failure strength of LR for different orientations of weakness planes, but an improved strength criterion is introduced to quantitatively capture the failure property of LR by considering the interaction between weakness planes and microcracks.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Engineering, Geological
Zhan Yu, Jianfu Shao, Yue Sun, Meng Wang, Minh-ngoc Vu, Carlos Plua
Summary: This study focuses on numerical modeling of temperature-induced cracking process in saturated porous rocks for radioactive waste disposal. Anisotropy and heterogeneity effects are considered, and macroscopic elastic properties are determined through homogenization. A phase-field model is proposed to describe crack initiation and propagation, with two damage variables representing tensile and shear cracks. New damage evolution criteria are defined with pore pressure effect. Three application examples validate the model's capability in capturing the progressive cracking process. The influence of elastic anisotropy and spatial variability on thermal cracking process are investigated, and numerical results are compared with experimental measurements.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2023)
Article
Engineering, Geological
Jueliang Chen, Siyu Liu, Wanqing Shen, Jianfu Shao, Minh-Ngoc Vu
Summary: This paper introduces a novel microstructure-based constitutive model to comprehensively characterize the mechanical behavior of anisotropic clay rocks under water saturation. The model considers elastoplastic deformation, time-dependent behavior, and induced damage, as well as interfacial debonding between the matrix and inclusions. The application of the model is demonstrated through the analysis of Callovo-Oxfordian clayey rocks.
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2023)
Article
Energy & Fuels
Zaobao Liu, Chuan Wang, Mingshan Zhang, Jian-fu Shao
Summary: This paper evaluates the cracking property and brittleness of Gonghe granite under high-temperature true triaxial compression conditions. The strength, deformation, and cracking characteristics of the granite are quantitatively evaluated and a novel brittleness index evaluation method is proposed. The study finds that the strength of Gonghe granite is reduced by more than 20% as temperature increases, and higher temperature contributes to a smoother fracture surface and reduced brittleness.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2023)
Article
Metallurgy & Metallurgical Engineering
Xiao Ma, Gui-ling Wang, Da-wei Hu, Hui Zhou
Summary: In this study, hydraulic fracturing experiments were conducted on granite at room temperature and 200 degrees C under different true triaxial stress to analyze their different fracturing mechanisms. The results showed that hydraulic fracturing at 200 degrees C can significantly reduce the breakdown pressure and fracture initiation pressure compared to hydraulic fracturing at room temperature. Moreover, the increase in fracturing volume at 200 degrees C was caused by the increment of micro-scale crack in the fractured sample, as observed from the nuclear magnetic resonance result.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2023)
